A power-and-free conveyor comprising a power line, a free line coextensive with the power line thereabove, a multiplicity of pivotally movable pushers adapted to travel with a drive chain for the power line, and free trolleys attached to carriers on the free line, each of the pushers being generally T-shaped when seen from front and including an attaching member and a horizontal engaging member provided at the forward end of the attaching member, each of the free trolleys having an engaging dog comprising a pair of opposed vertical engaging portions which are spaced apart from each other transversely of the free line at a distance, the engaging pusher member being engageable with at least one of the engaging portions of the engaging dog. The free trolley comprises a main body and a slider mounted thereon and slidable longitudinally of the trolley, the slider being provided with an engaging dog and an anticoasting dog, the slider being connected to the main body by a shock absorber.